Arm for lighting fixture



FIG. 1 is a perspective view of arm for lighting fixture, showing my new design;

FIG. 2 is a side elevational view thereof, opposite elevational view being a mirror image;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The broken line showing is included for the purpose of illustration only and forms no part of the claimed design. 

The ornamental design for an arm for lighting fixture, as shown and described. 